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Issue 21, 2013
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Coupled plasmons induce broadband circular dichroism in patternable films of silver nanoparticles with chiral ligands

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Abstract

This contribution reports the chiro-optic response of as-cast and photopatterned films of silver nanoparticles capped with photothermally-cleavable chiral ligands. We demonstrate broadband circular dichroism in these nanoparticle films, which is not present in dispersions of the nanoparticles capped with the chiral ligands. Long wavelength circular dichroism is derived from coupling of the plasmonic bands of neighbouring silver nanoparticles. Furthermore, the chiral response is preserved in the microstructured film after photopatterning using direct two-photon absorption in the plasmonic band of the silver nanoparticles. Thus, both the as-cast and photopatterned films show circular dichroism from the UV wavelength of intrinsic absorption of the ligand, through the plasmon resonances of both the isolated silver nanoparticles and the interacting nanoparticles, which extend to the near IR. Density functional theory (DFT) calculations of model electronic complexes of a chiral ligand and a small metallic cluster suggest that the new chiral bands at the plasmonic resonances are derived from new chiral hybrid electronic states of the metal nanoparticle–ligand complexes.

Graphical abstract: Coupled plasmons induce broadband circular dichroism in patternable films of silver nanoparticles with chiral ligands

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Publication details

The article was received on 24 Jun 2013, accepted on 31 Aug 2013 and first published on 03 Sep 2013


Article type: Paper
DOI: 10.1039/C3NR03244B
Nanoscale, 2013,5, 10550-10555

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    Coupled plasmons induce broadband circular dichroism in patternable films of silver nanoparticles with chiral ligands

    X. Vidal, W. J. Kim, A. Baev, V. Tokar, H. Jee, Mark. T. Swihart and P. N. Prasad, Nanoscale, 2013, 5, 10550
    DOI: 10.1039/C3NR03244B

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